42128835761 has 4 divisors (see below), whose sum is σ = 42237136500. Its totient is φ = 42020535024.

The previous prime is 42128835751. The next prime is 42128835773. The reversal of 42128835761 is 16753882124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2798410000 + 39330425761 = 52900^2 + 198319^2 .

It is a cyclic number.

It is not a de Polignac number, because 42128835761 - 2²² = 42124641457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42128835701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54149786 + ... + 54150563.

It is an arithmetic number, because the mean of its divisors is an integer number (10559284125).

Almost surely, 2^42128835761 is an apocalyptic number.

It is an amenable number.

42128835761 is a deficient number, since it is larger than the sum of its proper divisors (108300739).

42128835761 is a wasteful number, since it uses less digits than its factorization.

42128835761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108300738.

The product of its digits is 645120, while the sum is 47.

The spelling of 42128835761 in words is "forty-two billion, one hundred twenty-eight million, eight hundred thirty-five thousand, seven hundred sixty-one".